Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
  • C08L69/005—Polyester-carbonates

Definitions

• Copolyester-carbonates are known thermoplastic materials which, due to their many advantageous properties, find use as thermoplastic engineering materials.
• the copolyester-carbonates exhibit, for example, excellent properties of toughness, flexibility, impact resistance and high heat distortion temperatures.
• the copolyester-carbonates due to their relatively high melt viscosities, are generally relatively difficult to process.
• copolyester-carbonate resins exhibiting a greater degree of hydrolytic stability than that normally possessed by copolyester-carbonate resins are needed.
• blends of copolyester-carbonate resins and branched aromatic polycarbonate resins comprising from about 15 to about 99 weight percent of said copoly-' ester-carbonates and from about 1 to about 85 weight percent of said polycarbonates.
• Blends containing from about 1 to about 15 weight percent branched polycarbonate resin exhibit improved processability while retaining, to a substantial degree, the high heat distortion temperatures of unmodified copolyester-carbonates.
• Blends containing from about 15 to about 85 weight percent branched polycarbonate resin exhibit improved hydrolytic stability; while blends containing from about 20 to about 50 weight percent branched polycarbonate exhibit improved hydrolytic stability and improved thick section impact strength.
• the instant invention is directed to copolyester-carbonate blends. More specifically, the instant invention is directed to blends of copolyester-carbonate resins and branched aromatic polycarbonate resins comprised of from about 1 to about 85 weight percent of at least one high molecular weight aromatic randomly branched polycarbonate resin and from about 15 to about 99 wight percent of at least one copolyester-carbonate resin.
• copolyester-carbonates of the instant invention are known compounds which are disclosed, inter alia, in U.S. Patent Nos. 3,169,121; 3,030,331; 4,156, 069; 4,238,596 and 4,238,597, all of which are incorporated herein by reference.
• the high molecular weight aromatic copolyester-carbonates of this invention comprise recurring carbonate groups, carboxylate groups, and aromatic carbocyclic groups in the linear polymer chain, in which at least some of the carboxylate groups and at least some of the carbonate groups are bonded directly to ring carbon atoms of the aromatic carbocyclic groups.
• copolyester-carbonate polymers contain ester and carbonate bonds in the polymer chain, wherein the amount of the ester bonds is from about 25 to about 90 mole percent, preferably from about 35 to about 80 mole percent,relative to the carbonate bonds.
• ester bonds For example, 5 moles of bisphenol-A reacting completely with 4 moles of isophthaloyl dichloride and 1 mole of phosgene would give a copolyester-carbonate of 80 mole percent ester bonds.
• copolyester-carbonates are in general prepared by coreacting (i) a difunctional carboxylic acid or a reactive derivative thereof, (ii) a dihydric phenol, and (iii) a carbonate precursor.
• the dihydric phenols useful in the preparation of the copolyester-carbonates are represented by the general formula in which A is an aromatic group such as phenylene, biphenylene, naphthylene, anthrylene, etc.
• E may be an alkylene or alkylidene group such as methylene, ethylene, propylene, propylidene, isopropylidene, butylene, butylidene, isobutylidene, amylene, isoamylene, amylidene, isoamylidene, etc.
• E is an alkylene or alkylidene group, it may also consist of two or more alkylene or alkylidene groups connected by a non-alkylene or non- alkylidene group such as an aromatic linkage, a tertiary amino linkage, an ether linkage, a carbonyl linkage, a silicon-containing linkage, or by a sulfur containing linkage such as sulfide, suloxide, sulfone, etc.
• a non-alkylene or non- alkylidene group such as an aromatic linkage, a tertiary amino linkage, an ether linkage, a carbonyl linkage, a silicon-containing linkage, or by a sulfur containing linkage such as sulfide, suloxide, sulfone, etc.
• E may be a cycloaliphatic group such as cyclopentyl, cyclohexyl, cyclohexylidene, and the like; a sulfur containing linkage such as sulfide, sulfoxide, or sulfone; an ether linkage; a carbonyl group; a tertiary nitrogen group; or a silicon-containing linkage such as silane or siloxy.
• a cycloaliphatic group such as cyclopentyl, cyclohexyl, cyclohexylidene, and the like
• a sulfur containing linkage such as sulfide, sulfoxide, or sulfone
• an ether linkage such as a carbonyl group; a tertiary nitrogen group; or a silicon-containing linkage such as silane or siloxy.
• R is selected from hydrogen or a monovalent hydrocarbon group such as alkyl (methyl, ethyl, propyl, etc.), aryl (phenyl, naphthyl, etc.), aralkyl (benzyl, ethylphenyl, etc.), alkaryl, or cycloaliphatic (cyclopentyl, cyclohexyl, etc.)
• Y may be an inorganic atom such as chlorine, bromine, fluorine, etc.; an inorganic group such as the nitro group; an organic group such as R above; or an oxy group such as OR, it being only necessary that Y be inert to and unaffected by the reactants and the reaction conditions.
• Y substituents when more than one Y substituent is present, they may be the same or different. The same is true for the R susbtituent. Where s is zero in Formula I and u is not zero, the aromatic rings are directly joined with no intervening alkylene or other bridge.
• the positions of the hydroxyl groups and Y on the aromatic nuclear residues can be varied in the ortho, meta, or para positions and the groupings can be in a vicinal, asymmetrical or symmetrical relationship, where two or more ring carbon atoms of the aromatic hydrocarbon residue are substituted with Y and hydroxyl group.
• dihydric phenol compounds that may be employed in this invention, and which are represented by Formula I, include, but are not limited to:
• Preferred dihydric phenols are those wherein E is an alkylene, alkylidene, cycloalkylene, or c y cloal- kylidene group, A is a phenyl group, s is one, u is one, and t is one.
• any difunctional carboxylic acid conventionally used in the preparation of linear polyesters may be utilized in the preparation of the copolyester-carbonates of the present invention.
• the carboxylic acids which may be used include the aliphatic carboxylic acids, the aliphatic- aromatic carboxylic acids, and the aromatic carboxylic acids. These acids are disclosed in U.S. Patent 3, 169,121.
• the difunctional carboxylic acids which may be utilized in the preparation of the copolyester-carbonates generally conform to the formula wherein R 5 is an alkylene, alkylidene, aralkylene, aralkylidene or cycloaliphatic group; an alkylene, alkylidene or cycloaliphatic group containing ethylenic unsaturation; an aromatic group such as phenylene, biphenylene, and the like; two or more aromatic groups connected through non-aromatic linkages such as alkylene or alkylidene groups; and the like.
• R 4 is either a carboxyl or a hydroxyl group.
• the letter a represents one where R 4 is a hydroxyl group and either zero or one where R 4 is a carboxyl group.
• Preferred difunctional carboxylic acids are the aromatic carboxylic acids, i.e., those acids of Formula II wherein q is one, R 4 is a carboxyl or a hydroxyl group, and R 5 is an aromatic group such as phenylene, naphthylene, biphenylene, and the like.
• the preferred aromatic carboxylic acids are those represented by the general formula wherein:
• R 6 substituent When more than one R 6 substituent is present, they may be the same or different.
• difunctional carboxylic acids can also be employed, and where the term difunctional carboxylic acid is used herein mixtures of two or more different difunctional carboxylic acids as well as individual difunctional carboxylic acids are considered to be included therein.
• Preferred aromatic difunctional carboxylic acids are isophthalic acid, terephthalic acid, and mixtures thereof.
• a particularly useful mixture of isophthalic acid and terephthalic acid is one wherein the weight ratio of isophthalic acid and terephthalic acid is in the range of from about 1:10 to about 10:1.
• the preferred reactive derivatives of the difunctional carboxylic acids are the acid halides.
• Preferred acid halides are the acid dichlorides.
• isophthalic acid or terephthalic acid instead of using isophthalic acid or terephthalic acid it is possible to use isophthaloyl dichloride or terephthaloyl dichloride.
• the carbonate precursor employed in the preparation of the copolyester-carbonates can be a carbonyl halide, a diaryl carbonate, or a bishaloformate.
• the preferred carbonate precursors are the carbonyl halides.
• the carbonyl halides include carbonyl chloride, carbonyl bromide, and mixtures thereof.
• the preferred carbonyl halide is carbonyl chloride, also known as phosgene.
• the copolyester-carbonates may be prepared by any of the usual well known procedures. One of these procedures is the interfacial polymerization process.
• the polycarbonate that is admixed with the aforedescribed copolyester-carbonate to form the blends of the instant invention is a high molecular weight thermoplastic randomly branched aromatic polycarbonate.
• This type of polycarbonate is well known in the art and is derived from the coreaction of (i) a carbonate precursor; (ii) a dihydric phenol; and (iii) a small amount of a polyfunctional organic compound.
• dihydric phenols useful in preparing the polycarbonates of the instant invention can be represented by the general formula wherein:
• the divalent hydrocarbon radicals represented by W include alkylene radicals, preferably those containing from 2 to about 6 carbon atoms; alkylidene radicals, preferably those containing from 1 to about 6 carbon atoms, cycloalkylene radicals, preferably those containing from 4 to about 12 carbon atoms; and cycloalkylidene radicals, preferably those containing from 4 to about 12 carbon atoms.
• Preferred halogen radicals represented by R and R 8 are chlorine and bromine.
• the monovalent hydrocarbon radicals represented by R 7 and R 8 include alkyl radicals; preferably those containing from 1 to about 6 carbon atoms; aryl radicals, preferably those containing 6-12 carbon atoms; aralkyl radicals, preferably those containing from 7 to about 14 carbon atoms; and alkaryl radicals, preferably those containing from 7 to about 14 carbon atoms.
• the monovalent hydrocarbonoxy radicals represented by R 7 and R8 include the alkoxy and the aryloxy radicals.
• R 7 substituent When more than one R 7 substituent is present they may be the same or different. The same is true for the R 8 substituent.
• the positions of the hydroxyl groups and R 7 and R 8 on the aromatic nuclear residues can be varied in the ortho, meta, or para positions and the groupings can be in a vicinal, asymmetrical or symmetrical relationship, where two or more ring carbon atoms of the aromatic hydrocarbon residues are substituted with R and/ or R 8 and hydroxyl groups.
• dihydric phenols represented by Formula V include: 2,2-bis-(4-hydroxyphenyl)propane (bisphenol A); 1,1-bis-(4-hydroxyphenyl)ethane; 1,1-bis-(3,5-dimethyl-4-hydroxyphenyl)cyclohexane; l,3-bis-(3-methyl-4-hydroxyphenyl)propane; 2,2-bis(3,5-methyl-4-hydroxyphenyl)propane; bis-(4-hydroxy-2,6-dimethyl-3-methoxyphenyl)methane; bis-(2-hydroxyphenyl)methane; and the like.
• dihydric phenol it is meant to include mixtures of two or more dihydric phenols as well as single dihydric phenols.
• the preferred dihydric phenols from the standpoint of the instant invention, are those wherein b is one.
• W is an alkylidene or alkylene radicals and the hydroxy groups are in the 4, 4' positions.
• the carbonate precursor employed in the production of the branched polycarbonates useful in the instant blends can be a carbonyl halide, a diaryl carbonate, or a bishaloformate.
• the preferred carbonate precursors are tne carbonyl halides.
• the carbonyl halides include carbonyl chloride and carbonyl bromide, and mixtures thereof.
• the preferred carbonyl halide is carbonyl chloride, also known as phosgene.
• polyfunctional organic compounds used in making the instant branched polycarbonates are well known in the art and are disclosed, for example, in U.S. Patent Nos. 3,525,712; 3,541,049; 3,544,514; 3,635,895; 3,816,373; 4,001,184; 4,294,953 and 4.,204,047, all of which are hereby incorporated herein by reference.
• These polyfunctional organic compounds are generally aromatic in nature and contain at least three functional groups which may be, for example, hydroxyl, carboxyl, carboxylic anhydride, halformyl, and the like.
• polyfunctional compounds include trimellitic anhydride, trimellitic acid, trimellityl trichloride, 4-chloroformyl phthalic anhydride, pyromellitic dianhydride, mellitic acid, mellitic anhydride, trimesic acid, benzophenonetetracarboxylic acid, benzophenonetetracarboxylic anhydride, 4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl) heptene-2, 4,6-dimethyl-2,4,6-tri-(4-hydroxyphenyl) heptane, and the like.
• the amount of this polyfunctional organic compound or branching agent used is in the range of from about 0.05 to about 2 mole %, based on the amount of dihydric phenol employed, preferably from about 0.1 to about 1 mole %.
• the instant branched polycarbonates are prepared by reacting the carbonate precursor, the dihydric phenol, and the branching agent.
• the carbonate precursor, dihydric phenol and branching agent are preferably mixed in an aqueous medium which contains a solvent for the resultant polycarbonate, a catalytic amount of a polymerization catalyst and a molecular weight regulator.
• the instant invention is directed to blends of copolyester-carbonate resins and branched polycarbonate resins which contain from about 1 to about 85 weight percent of at least one branched polycarbonate resin and from about 15 to about 99 weight percent of at least one copolyester-carbonate resin, based on the amount of copolyester-carbonate resin and branched aromatic polycarbonate resin present in the blends.
• these blends exhibit improved processability while maintaining, to a substantial degree, the relatively high heat distortion temperatures of unmodified copolyester-carbonates.
• these blends exhibit improved hydrolytic stability as compared to unmodified copolyester-carbonate resins. At certain intermediate ranges of branched polycarbonate, these blends exhibit improved hydrolytic stability and improved thick section impact strength.
• blends of copolyester-carbonate resin and randomly branched thermoplastic polycarbonate resin exhibiting improved processability while simultaneously exhibiting, to a substantial degree, generally similar heat distortion temperatures as those of unmodified copolyester-carbonates.
• the amount of the branched aromatic polycarbonate resin present in the blends is critical. If the blends contain too little of the branched polycarbonate there is no appreciable improvement in the processability of the blends. If too much of the randomly branched polycarbonate is present in the blend, there is an improvemnet in the processability of the blend but only at the expense of the heat distortion temperature of the blend. That is to say, if too much of the branched polycarbonate is present in the blend the processability is improved, i.e., the melt flow rate increases and the melt viscosity decreases, but the heat distortion temperature decreases.
• the blends of this embodiment contain an amount of randomly branched polycarbonate effective to improve the processability of the blends but insufficient to significantly deleteriously affect the heat distortion temperature thereof.
• this amount is in the range of from about 1 to about 15 weight %, preferably from about 2 to about 10 weight %, based on the amount of copolyester-carbonate resin and branched polycarbonate resin present in the blends.
• the amount of the branched polycarbonate resin contained in the blends is less than about 1 weight %, there is no appreciable improvement in the processability of the blends. If, on the other hand, the blends contain more than about 15 weight % of said branched polycarbonate resin, the heat distortion temperatures of the blends begin to decrease.
• the blends contain a branched aromatic polycarbonate. If the blends contain instead the same critical amounts of a non-halogenated linear polycarbonate resin, there will be an improvement in the processability of the blends but only at the expense of the heat distortion temperatures.
• blends of copolyester-carbonate resin and branched aromatic polycarbonate resin exhibiting improved hydrolytic stability as compared with unmodified copolyester-carbonate resins.
• these blends exhibit a greater hydrolytic stability than that exhibited by either the copolyester-carbonate resins or the branched aromatic polycarbonate resins alone.
• the blends of this embodiment contain an amount of at least one branched aromatic polycarbonate resin effective to improve the hydrolytic stability of these blends. That is to say, these blends contain a hydrolytic stability improving amount of at least one branched aromatic polycarbonate resin. Generally, this amount is in the range of from about 15 to about 85 weight percent of the branched aromatic polycarbonate resin, based on the total amount of copolyester-carbonate resin and branched aromatic polycarbonate resin present in the blends. Preferably, these blends contain from about 20 to about 85 weight percent of at least one branched aromatic polycarbonate resin. Blends containing from about 20 to about 85 weight percent of the branched polycarbonate resin exhibit hydrolytic stability which is greater than that exhibited by either the copolyester-carbonate resin alone or the branched aromatic polycarbonates alone.
• a third embodiment of the instant invention are blends of copolyester-carbonate resins and branched aromatic polycarbonate resins exhibiting improved processability and improved thick section impact stren g- th, as compared with unmodified copolyester-carbonate resins.
• the blends of the instant invention exhibit a greater hydrolytic stability and a greater thick section impact strength than that exhibited by either the copolyester-carbonate resin alone or the thermoplastic randomly branched aromatic polycarbonate resin alone.
• the blends contain an amount of the branched polycarbonate resin effective to improve the hydrolytic stability of said blends and to improve the thick section impact strength of the blends.
• this amount is in the range of from about 20 to about 50 weight percent, based on the amount of the polycarbonate resin and copolyester-carbonate resin present.
• the improvement in the thick section impact strength exhibited by the blends at the aforedescribed concentrations of polycarbonate resins begins to significantly decrease.
• the method of blending the copolyester-carbonate resin with the branched polycarbonate resin is not critical and does not constitute part of this invention.
• One method of preparing the instant blends for example, comprises blending the two preformed resins in powder or granular form, extruding the blend, chopping into pellets, and re-extruding.
• the blends of the instant invention may optionally have admixed therewith the commonly known and used additives such as antioxidants; antistatic agents; glass fibers; impact modifiers; fillers such as mica, talc, clay and the like; colorants; ultraviolet radiation absorbers such as, for'example, the benzophenones, benzotriazoles, cyanoacrylates, and the like; color stabilizers such as the organophosphites disclosed in U.S. Patent Nos. 3,305, 520 and 4,118,370, both of which are incorporated herein by reference; hydrolytic stabilizers such as the epoxides disclosed in U.S. Patent Nos. 3,489,716; 4,138,379 and 3, 839,247, all of which are incorporated herein by reference; flame retardants; and the like.
• additives such as antioxidants; antistatic agents; glass fibers; impact modifiers; fillers such as mica, talc, clay and the like; colorants; ultraviolet radiation absorbers such as, for'exa
• Some particularly useful flame retardants are the alkali and alkaline earth metal salts of sulfonic acids. These types of flame retardants are disclosed in U.S. Patent Nos. 3,933,734; 3,931,100; 3,978,024;-3,948,851; 3,926,908; 3,919,167; 3,909,490; 3,953,396; 3,953,399; 3,917,559; 3,951,910 and 3,940,366, all of which are hereby incorporated herein by reference.
• the pH is maintained in the range of 8.5 - 11.5 by the addition of 25% aqueous sodium hydroxide.
• the resulting mixture is phosgenated by the introduction of phosgene at the rate of 36 grams per minute for 15 minutes with the pH controlled at 9.5 to 12 by the addition of aqueous sodium hydroxide solution.
• 6 liters of methylene chloride are added, the brine layer is separated by centrifuge, and the resin solution is washed with aqueous acid and thrice with water.
• the resin is steam precipitated and dried in a nitrogen fluid bed drier at approximately 240°F. This resin product is then fed to an extruder operating at a temperature of about 600°F.
• the Kasha Index is an indication or measure of the processability of the resin, i.e., the lower the KI the greater the melt flow rate and, therefore, the better the processability.
• the Kasha Index is a measurement of the melt viscosity of the resin.
• the procedure for determining the Kasha Index is as follows: 7 grams of resin pellets, dried a minimum of 90 minutes at 125°C,are added to a modified Tinius-Olsen model T3 melt indexer; the temperature in the indexer is maintained at 300°C and the resin is heated at this temperature for 6 minutes; after 6 minutes the resin is forced through a 0.04125 inch radius orifice using a plunger of radius of 0.1865 inches and an applied force of 17.7 pounds; the time required for for the plunger to travel 2 inches is measured in centiseconds and this is reported as the KI. The higher the KI, the higher the melt viscosity and the more viscous the resin,.and the more difficult to process.
• Examples 7 and 8 exhibit a greater thick section impact strength than that possesed by either the branched polycarbonate resin alone or the copolyester-carbonate resin alone.

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• 1982
  • 1982-12-27 US US06/452,908 patent/US4436879A/en not_active Expired - Lifetime
• 1983
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